[YENKO DEUCE REGISTRY]

You are correct in that without the original engine or paperwork it is difficult to determine what engine / options came with the car. What I can tell from the trim tag is that this car has a standard grade, black, bench seat interior (code 731), was originally Lemans Blue top & bottom (code 71 71), was scheduled to be built during the first week in July (code 07A), has interior components that are also painted black (code A), and it does not have any exterior moldings, ie; drip rail, door frame, body side or rocker (code 'blank' after the A).

Items to look for that could indicate an SS or a BB would be the unique radiator core support, fuel line, dual exhaust plate on the drivers side frame rail, engine mounts, heater box cover, if it has a power brake booster but drums on the front - look for the disc brake hose holes on the upper A arms, if it has the original hood look for the hood grille support brackets under the hood...

I'm sure others will chime in with more items to look for.